iOS UITableView绘制的单元格奇怪

Question

我有一个UITableView应该只显示一个UISwitch在第一部分，第一行，但由于某种原因，开关正在显示在第4部分。另外，当开关打开/关闭时，一个新的UISwitch出现在另一个单元中。它表现得很奇怪。任何帮助将不胜感激。

代码：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    static NSString *CellIdentifier = @"Cell"; 

    PrettyTableViewCell *cell = [tableViewdequeueReusableCellWithIdentifier:CellIdentifier]; 
    if (cell == nil) { 

     cell = [[PrettyTableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier]; 
     cell.tableViewBackgroundColor = tableView.backgroundColor; 
    } 

    [cell prepareForTableView:tableView indexPath:indexPath]; 
    cell.cornerRadius = 10; 

    if (indexPath.section == 0) { 
     if (indexPath.row == 0) { 
      cell.textLabel.text = @"Push Notifications"; 
      pushNotificationSwitch = [[UISwitch alloc] init]; 
      pushNotificationSwitch.on = pushSwitchState; 
      cell.accessoryView = pushNotificationSwitch; 
      [pushNotificationSwitch addTarget:self action:@selector(pushSwitch:) forControlEvents:UIControlEventValueChanged]; 
      cell.userInteractionEnabled = YES; 
      cell.selectionStyle = UITableViewCellSelectionStyleNone; 
     } 
    } 

    if (indexPath.section == 1) { 
     if (indexPath.row == 0) { 
      cell.textLabel.text = @"Department Based"; 
      if (departmentBased) { 
       cell.accessoryType = UITableViewCellAccessoryCheckmark; 
      } 
      else { 
       cell.accessoryType = UITableViewCellAccessoryNone; 
      } 
      cell.userInteractionEnabled = YES; 
     } 
     if (indexPath.row == 1) { 
      cell.textLabel.text = @"Location Based (GPS)"; 
      if (locationBased) { 
       cell.accessoryType = UITableViewCellAccessoryCheckmark; 
      } 
      else { 
       cell.accessoryType = UITableViewCellAccessoryNone; 
      }   cell.userInteractionEnabled = YES; 
     } 
    } 

    if (departmentBased) { 
     if (indexPath.section == 2) { 
      if (indexPath.row == 0) { 
       cell.textLabel.text = @"xxxxxx"; 
      } 
      if (indexPath.row == 1) { 
       cell.textLabel.text = @"xxxxxx"; 
      } 
      if (indexPath.row == 2) { 
       cell.textLabel.text = @"xxxxxx"; 
      } 
      if (indexPath.row == 3) { 
       cell.textLabel.text = @"xxxxxx"; 
      } 
      if (indexPath.row == 4) { 
       cell.textLabel.text = @"xxxxxx"; 
      } 
      if (indexPath.row == 5) { 
       cell.textLabel.text = @"xxxxxx"; 
      } 
      if (indexPath.row == 6) { 
       cell.textLabel.text = @"xxxxxx"; 
      } 
     } 
     if (indexPath.section == 3) { 
      if (indexPath.row == 0) { 
       cell.textLabel.text = @"xxxxxx"; 
      } 
      if (indexPath.row == 1) { 
       cell.textLabel.text = @"xxxxxx"; 
      } 
      if (indexPath.row == 2) { 
       cell.textLabel.text = @"xxxxxx"; 
      } 
      if (indexPath.row == 3) { 
       cell.textLabel.text = @"xxxxxx"; 
      } 
      if (indexPath.row == 4) { 
       cell.textLabel.text = @"xxxxxx"; 
      } 
      if (indexPath.row == 5) { 
       cell.textLabel.text = @"xxxxxx"; 
      } 
      if (indexPath.row == 6) { 
       cell.textLabel.text = @"xxxxxx"; 
      } 
      if (indexPath.row == 7) { 
       cell.textLabel.text = @"xxxxxx"; 
      } 
      if (indexPath.row == 8) { 
       cell.textLabel.text = @"xxxxxx"; 
      } 
     } 
    } 
    return cell; 
} 

Answer 1

遇到电池可重用的iOS中的作用。您为所有单元格使用相同的单元格标识符，因此当您滚动时，旧单元格将变为可用并从tableView中出列。

尝试后设置cell.accessoryView到零右：

if (cell == nil) { 
    cell = [[PrettyTableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier]; 
    cell.tableViewBackgroundColor = tableView.backgroundColor; 
} 

cell.accessoryView = nil; 

另外，选择不同的小区标识为第一indexPath，确保你出列时考虑到这一点。

BOOL firstCell = indexPath.row == 0 && indexPath.section == 0; 
NSString *CellIdentifier = firstCell ? @"CellWithSwitch" : @"Cell"; 

PrettyTableViewCell *cell = 
     [tableViewdequeueReusableCellWithIdentifier: CellIdentifier]; 

if (cell == nil) { 
    cell = [[PrettyTableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier]; 
    cell.tableViewBackgroundColor = tableView.backgroundColor; 
}